Threat matrix: at a U.S. government cybersecurity center in Arlington, Virginia, January 2015.

Larry Downing / Reuters

Cyberspace has been recognized as a new arena for competition among states ever since it came into existence. In the United States, there have long been warnings of a “cyber–Pearl Harbor”—a massive digital attack that could cripple the country’s critical infrastructure without a single shot being fired. Presidential commissions, military task force reports, and congressional investigations have been calling attention to such a risk for decades. In 1984, the Reagan administration warned of the “significant security challenges” of the coming information age. And just this year, Dan Coats, the director of national intelligence, said of such threats, “the lights are blinking red.”

Yet the Internet has always been much more than a venue for conflict and competition; it is the backbone of global commerce and communication. That said, cyberspace is not, as is often thought, simply part of the global commons in the way that the air or

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MICHÈLE FLOURNOY is Co-Founder and Managing Partner of WestExec Advisors. From 2009 to 2012, she served as U.S. Undersecretary of Defense for Policy.

MICHAEL SULMEYER is Director of the Cyber Security Project at the Belfer Center at the Harvard Kennedy School. From 2012 to 2015, he served as Director for Cyber Plans and Operations in the Office of the U.S. Secretary of Defense.